tailieunhanh - Tuning Workshop

Small shared pool Small database buffer cache Small redo log buffer cache Missing indexes Rollback segments and undo tablespace Sort area size incorrectly set Assorted | Tuning Workshop Workshop Scenarios Small shared pool Small database buffer cache Small redo log buffer cache Missing indexes Rollback segments and undo tablespace Sort area size incorrectly set Assorted Workshop Scenario At the beginning of each scenario, the database is shut down and then restarted. When resizing memory components, do not consume more memory than is actually required to meet the requirements of the objects given. For example, there is little point in resizing the shared pool to 500 MB. The purpose of the workshop is to be as realistic as possible. The company concerned has at present two OLTP users and two DSS users. The system was set up by a trainee DBA, and though it works, the performance is very slow. You have been invited in to resolve the current performance problems, and to prepare the present system for an increase in the number of users accessing the database. The company is about to expand to 10 of each type of user (twenty users in all). At the same time | Tuning Workshop Workshop Scenarios Small shared pool Small database buffer cache Small redo log buffer cache Missing indexes Rollback segments and undo tablespace Sort area size incorrectly set Assorted Workshop Scenario At the beginning of each scenario, the database is shut down and then restarted. When resizing memory components, do not consume more memory than is actually required to meet the requirements of the objects given. For example, there is little point in resizing the shared pool to 500 MB. The purpose of the workshop is to be as realistic as possible. The company concerned has at present two OLTP users and two DSS users. The system was set up by a trainee DBA, and though it works, the performance is very slow. You have been invited in to resolve the current performance problems, and to prepare the present system for an increase in the number of users accessing the database. The company is about to expand to 10 of each type of user (twenty users in all). At the same time the company is unwilling to spend extra on new hardware components. Therefore, the management has imposed a limit of 20 MB for the entire SGA. Workshop Methodology Workshop Methodology Perform the following steps: Make sure that the job scheduler is set to collect statistics at least every 10 minutes or use manual snapshot collection. Open the WORKLOAD window and select the desired workload. Each scenario has a icon labeled with the scenario number. Allow time for some statistics to be generated (at least 20 minutes). Shorter time periods make it more difficult to determine where problems exist. The workload generator has been set to run for a minimum of 20 minutes. After 20 minutes the users will complete what they are working on and then log off the database. Check each window before closing for any errors that the user might have received. Generate a report by running the script. Choose a start and end time that falls between the period that the workload generator was .

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